Subsolidus crystallization behaviour in the system KAlSi3O8–NaAlSi3O8–H2O
- 1 June 1969
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 37 (286) , 173-180
- https://doi.org/10.1180/minmag.1969.037.286.03
Abstract
Summary: When gels and glasses of alkali feldspar composition are crystallized hydrothermally below their solidus the crystals present when crystallization is incomplete do not have the same Na:K ratio as the starting material but bear a relation to the starting material analogous to that between crystals and liquids coexisting at the liquidus. This effect has been investigated in the temperature range 700–850 °C at water-vapour pressures between 5000 lb/in.2 and 30000 lb/in.2 Fractionation and normal zoning of crystals may, in principle, occur within fixed bulk compositions held under isothermal, isobaric conditions.Keywords
This publication has 3 references indexed in Scilit:
- Homogeneity in alkali feldsparsMineralogical Magazine and Journal of the Mineralogical Society, 1968
- Obsidian-H2O viscosities at 1000 and 2000 bars in the temperature range 700° to 900°CJournal of Geophysical Research, 1963
- The System NaAlSi3O8-KAlSi3O8-H2OThe Journal of Geology, 1950